Path: news.eternal-september.org!eternal-september.org!.POSTED!not-for-mail
From: John R Walliker <jrwalliker@gmail.com>
Newsgroups: sci.electronics.design
Subject: Re: "Barrel" connectors
Date: Mon, 16 Jun 2025 14:17:42 +0100
Organization: A noiseless patient Spider
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On 16/06/2025 11:47, Chris Jones wrote:
> On 16/06/2025 11:28 am, Don Y wrote:
>> On 6/15/2025 1:50 PM, Don Y wrote:
>>> Is there a better way?
>>
>> Cancel that.  A colleague has something in the mail to me, already!
>>
> 
> Let us know if it is any good. It is a problem that I have too.
> 
> I somewhat distrust that type of connector in general, unless both parts 
> come from the same manufacturer - some of them have a slit inner pin 
> that is slightly springy/compliant and would be appropriate to fit in a 
> solid tube in the other part, whereas others have a solid pin and some 
> of the sockets have a bifurcated springy inner contact. Where there is a 
> solid pin fitting in a solid tube, it seems they only work because there 
> is a sideways force on the whole thing from the asymmetrical outer 
> contact. Seems dodgy.
> 
> I've also come across the belief amongst the general public that it's ok 
> to plug in any of these barrel connectors as long as they fit, 
> presumably because that's mostly true of USB and so on. So they fry 
> their modem that wants 12VDC by plugging in a 15VAC adapter or whatever.

Power supplies for POE+ switches often use the same connector type but
deliver about 52V at a few amps.

John